All-atom and coarse-grained force fields for polydimethylsiloxane

All-atom and coarse-grained force fields for polydimethylsiloxane
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聚二甲基硅氧烷的全原子和粗粒力场

DOI:
10.1080/08927022.2017.1328597
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发表时间:
2017-06
影响因子:
2.1
通讯作者:
Sun Huai
Sun Huai
中科院分区:
化学4区
文献类型:
--
作者:
Huang Hao;Cao Fenglei;Wu Liang;Sun Huai

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摘要结合自下而上和自上而下的方法,我们从量子力学和实验数据出发建立了一个新的全原子(AA)力场,并从AA模拟和实验数据出发建立了一个新的粗粒(CG)力场,用于聚二甲基硅氧烷(PDMS)。AA力场是基于TEAM力场数据库开发的。CG力场使用的映射规则,分裂成相邻的CG珠连接的氧,以保持电荷中性的珠,分析功能形式,包括非谐项的价项,和温度依赖的自由能功能形式来描述珠间的相互作用。计算了PDMS的密度、表面张力、溶解度参数、回转半径和玻璃化转变温度等热力学性质,验证了力场的有效性,并与实验数据进行了比较。
Abstract By combining the bottom-up and top-down approaches, we have developed a new all-atom (AA) force field from quantum mechanics and experimental data and a new coarse grained (CG) force field from AA simulation and experimental data, for polydimethylsiloxane (PDMS). The AA force field is developed based on the TEAM force field database. The CG force field uses a mapping rule that splits the connecting oxygen into neighbouring CG beads to maintain the charge neutrality of the beads, analytical functional forms including anharmonic terms in the valence terms, and the temperature-dependent free-energy functional form to describe the inter-bead interactions. Broad range of thermodynamic properties of PDMS including density, surface tension, solubility parameter, radius of gyration and glass transition temperature are calculated to validate the force fields, and good agreements with the experimental data are obtained.
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